Air gauge and control valve



July 1, A1930.l P. GWISDALLA 1,769,132

AIR GAUGE AND CONTROL VALVE',

Filed Oct, 28, 19,27

Patente-l4 Juily `1, 1930V ,PffAsT.Esme@mee rn'rnn. GwIsDALLA,ornn'rRoIr, :MIcnrGANl 1.3 `Am `entrer: AND coNTnoL `vsnvn Appnmnmyfiled octoberas, 19am seria; Np.u22`9,45`s. f 'l `My inventionrelates toa new and useful` improvement 1n/an" air gauge and controlvalve vadaptedfor yinterposmg v1n a pressure' air line so that' the. pressure oftheair built up .by the air through the air line may be determined andregulatedand Sothat when apredetermined `pressure has been built kupthepassage of'V air .through the air line may be automaticallyprevented.

The-inventionis particularly adapted for use on the tlexiblecon'duit orhose usedat `air ffilling stations for intiatinfr tires, ,andl serves toprovide a means where ythe pressure ofthe air inthe tire maybeautomatically controlled by anadjustmentgof `the invention A .j Y I amaware that there have been air scales andA air measuring devices adaptedfor use -atqiillingv stations and the like, 4whichlmayV be adjusted to acertain predetermined pressure and willfserve to cut 0El the supplyv ofair `when the `predetermined i pressure has been built. up infthe tire,but theseV devices are large,cunibersome and expensive, where-v as thepresent'inventionis attached to the air conduititself, isy simpleinstructure, economical. of manufacture, highlyv etlicient` in use, kandinexpensive to install' and maintain. Y vTo provide such a device 1s anobject of the 3Q present invention and to"V provide. the detail ofstructure set out inthe speciiication-and drawings also forms any objectontheinvention. .v I f Y. i

Other objects, will appear hereinafter.

l Thevinventionconsists iny the, combination ,andfarrangement otlpartshereinafter described and claimed. .s ij 4 .-.iThe invention Nwillbebest understood by 'a reference tothe accompanying drawings 40, whichVform a part of this'specification,y and in whicln;r i Y i o Fig. lfisatopplan view oftheinventon. Fig. 2 is a view. taken .onsubstantiallyline Fig. 4 is a view taken .on `line4,4 of Fig, 2.lAlthough various modifications of thein- -vention may beel'ectedt isthe intentionr to `provide adevice of this .class -which will be W`small and compact ,s pilht ,IAQ ,largeweight will be added tothe-weightof the'exible conduit or airline itself. i

, In the drawings Ijh ve illustrated a housingy icomprising a baseportion 8,projecting outwardly from one side of which is a nipple 9,,upon which may be attacheda hose or other suitable air conduit. A`nipple lOpro- .jects outwardly from the opposite side, and

vthreadedupon the nipple` 10 is the air nozzle 13 rwhich is adapted toitover the valvestem of a tire, this nozzle 13 being of conventional n'typeandofa lstructure well known.

Formedin the base portion 8 is arecess 14 i y closed at its lower end bya suitable plug-15,

this plug making an airtight connection. A

cover 16 is provided for the base portion 8, andis secured to the baseportionbyscrews 17 threaded thereinto. A- ange 18 isl adapted to embracethe upwardlyv projecting fiange 19 on the base portion 8. f The cover isprovided with la recess 20,; thus making a sortof cupev Shaped cover1,6.` In the top of the coverfthere isprovided an opening 2.1. rRotatably mounted in the recess 20 isa disc 22 having aneck 23 v'projectingfthroughl the opening 21 and upon ywhich is. mounted` a knob24 and a pointerv25frotating therewith. The lower face ofthe disc 22 isprovided with the recess 26, Athis recess being ormedeccentric so thatthe disc22 is thickerjat `its, periphery than atits center, thethicksportion tapering from ythewide end 27 .tothe narrow4 end 28. En-

gaginglb'etween the flange 19 and thev ,coverV 16 is a disc`29 throughwhich the bolts orvscrews 17 also. project, this disc 29 having acentral opening; 'j Positioned below the disc29and f .engaging kat `itsVperiphery the inner surface Vof the liange 19 is a ieXible disc`30prefer- `projecting outwardly from theopen end of ,the cup-shapedniember33, this iange beingl also secured to thedisc 30 by cementing orotherwise.- `The stem31 is; rpressed into the CIZ cup-shaped member 33with a press fit. A leaf spring 35 is engaged between the disc 29 andthe vcover 16, and extends inwardly so as to embrace theV neck 33 at itsjuncture with the flange 34 at its bifurcations 36, this spring 35 beingbentdownwardly as shown in Fig. 2. It will be noted that thespringengages the undersurface of the disc 22 `so. that the Y edge ofthe undersurfaceof the disc 22 which engages the spring serves to,determine the y point at which the spring will vflex when pressure isexerted upon itsfree end. c

It is evident that as thev disc 22 is rotated and the broader portion 27of the under'su'r-l face of the. disc 22-is brought intoengagementthe'r'ewitli', the lengt-h of the' spring which may flex isconsiderably shortened.

This' shortening' of the bendingf or movingportion ofthe springwirk 35is graduallyf'accomplished as 'thedisc 22`is rotated.

Extending 'throughf the" nipple 9 and through-the" basetportion so'a'sto communica`te'A'withl therecessl't is` a passageway 37,

` Forniedon'tlreupper 'surface of thebase portion 8,v centrally thereof,are'ra'dially extendi 'Tbreaaa "ony als iwet ena- `ai amaai of r'tdf3la'valveplug'4l having a cupi-shaped portion 42i`n Which is positionedpacking 43 rubber, leather, or' other suitable yieldalblematerial."- I j`l j A jf It irs/believed levident `tl1atwhen the packman tangaiiiaeamaamieaaoabetween ther'o'pening'38 iand 'tliiepassag'e" '37:closed,

thepacltngf43fservingfagian efficient seal. 'i imperantes; whe chedevice1s' assembled,

le A"thro'ugh the' fnozle 13' to build pre'deterniiired pres's`|1`1"re,'the piiiiter fis'ft-'uifned *tofindicafta by the'lgradui afti formedion Athe outer lsurface 'ofthe coverf'fflti, fthe desired(pressure".IWhen this pointer isi-,turned to' the fposti'onf desired theAVVsaiifaf'c'e""ofthe disc 22fwil'yllhavebeen ino' dj so* that tlielproper width ,thereof is in engagement lthe spring 35', this-spring 35jserving normally to 'pressv downwardly o'n Athe flange 3 4 so ast'retainthepacling 43 free fromgengagement with the base portion 8i:thus ma-iiitainiiigv communication between fpaseaoejaranaaiefpasfsag-rof The pasi- 37 coninnin'icating'withl the larger comip`artin`ent`-'149will-serve to deliver the air throu h' the opening 44and the passage 40 'iiiitil t epressui'e hasbeen built u'pw'hich' i'sdanig. 2, "andinia desired ifi-inflate built up suficient upwardpressure will be exerted on the flexible member and the disc 32 to flexthe spring 35 upwardly and thus bring the packing 43 into engagementwith the base portion 8 so as` to close the opening 44.

When the wider portion of the-disc 22 engages the spring-35V a greaterstrain is necessary in order to flex the spring 35 upwardly. The.pressure of thes ring 35, therefore, variesfiii 'direct'proprti'n to thewidth ofthe surface of the-,disc 22 which engages it, this surface beingof a shape which may properly bev termed a'cam surface. Consequently,the pressure necessary tov move the valve,.which comprises"theplug 41,the 1rcup-sliaped portion 42 and th'epacki'ng 43,'int'o closing posiSition, varies directly 'in yproportion *tothe width 'ofthe camWhichengagesfthe spring 35.' Vhile I Vhave illustrated and'd'escribedthe preferred form of my inventiomffdo! not; wish' to limit myself cto;the precisev details of structure shown, but desire to'V avail myself ofsuch variations andllnodiiic'ations asco'mel within'th'es'copeofthefapp'ended claims.

Havingth'us "described my inventionfwhat' I'claim'as new and desire tosecure `by Letters Patent-is: l control valve oftheclass vdescribedad'aptedl'for controlling the vflow of" fluid through a pressure line,comprising a main body having an v.inlet porti and' an-.outlet port,said inlet port communicating with said' pressure line meansforopeninfgand' closing.

communication between ysaid inlet 4port and said outlet port', saidmeansmoving to closed position in resl'aonsefto the pressure built 'up'intermediate said inlet portland' said outlet Vportz; yield'able meansfor normally resisting movement ofsaidopening 'and closing means toclosed position; and` means jengafgeable with'V said resistance meansvarying in width from'one end to the other and movable relatively to'said resistance means for bringing different widths' thereof intoengagement with'Y said resistance'meansand varying theresistanceo'fthe'same.` 1

2. A control valve of the class described adapted for controlling? the'flow of Vfluid throu'ghay pressure line, comprising: a main bodyhavingan inletport and an outlet port, said inlet port communicatingwith said pressure line; means for opening and closingcommunicat'i'on-'between said inlet portland said v voutlet port,V saidmeans moving toclosed position in response to the pressure built upfin'-te'rmediate said' inlet port "and, said outlet port; yield'able'meansfornormally resisting movement of said opening and closing means l,

to' closedjposition'; rand?mfean's-'engageable with'said resistancemeans varyingin width from one endto the other and movable'frelativelyto sai'dlresistanc'e means for! bringing different widths thereof into"engagement with/said reslstancemeans andfvarying the iso resistance ofthe same directly in proportion to ther Width engaging therewith.` f

3. A control valveyof the Class described,

comprising: a main body having an inlet and an outlet port communicatingWith each other through an'expansion chamber; a valve movably positionedin n said expansion Chamber for closing communication of said outletport therewith; yieldable means normally resisting movement of saidvalve to closing position; and a rotatable memberA having an en-k gagingsurface for engaging said lresistance means, the Width of said engagingsurface varying from end to end, the variation of the Width of saidengaging surface varying in direct proportion to the resistance of saidre sistanoe means.

4. A control valve of the Class described comprising: a main body havingan inlet to retain said valve in open position; andv rotatable meansenclosed by said cover and engaging said leaf spring and being of variedWidththroughout its length at the engagement vportion for regulating thelength ofthe flexing portion of said leaf spring. f

In testimony whereof foregoing specification.

` PETER GWISDALLA.

I have signed' the

